Just to give my fellow 350 people a slight review on the product.
I got these installed not too long ago as a backyard job (but we know what we are doing, done many times before). They were very easy to install with the design of the mono block callipers of the IS350, up and down in just under an hour for front and back. The longest part was figuring out the pins on the rear callipers.
Start up: So I as soon as I took them out, i noticed that there was something not quite right. The pedal felt so completely weird. It was soft, spongy and went deep into the firewall. Now I don't know if its the fluid or the brake master cylinder design of the car, but I have never had this happen to any other car that i've put pads in. My mates thought my face was broken as I was pulling odd faces. And before anyone calls me a noob, I know the pedal feel should change due to setting of the pistons etc, but when I said weird... i meant it.
Rolling out: Under the advice of my mates, I took the car out and instantly the brakes began to fix themselves. I took it up the road and just park it, while we did some coil overs.
Bedding: So the bedding process was pretty much done like any other car I do (except this was in the *BLEEP*ty rain! fml). Drive a little bit down the road with the brake slightly on while also on the gas just to get them warm. Brakes instantly felt good, real good! Next was to get a bit of speed and hit the brakes hard and get some real heat into them. This was the great fun! Some face pulling followed by a smile.
On the road: From the impression i got from the bedding process I was happy. But when I drove normally on the road, the difference was clear. I didn't just get (apparently) dustless pads (haven't had them long enough), I got some bloody performance pads! They offered slightly better feel but a whole lot more instant braking force and bite. Amazing!
Part 2 was to go aggressive on the brakes with some hard hits. To be honest I couldn't tell a performance gain, but I'm not surprised. I've never been able to feel an improvement on the street under hard braking with any race/sport pad. and since I'm not going to track this family car, I don't really care about fade or the upper temperatures.
But going by the extra stopping power and feel on the lower end of the temperature spectrum, I would think they offer some improvement in fade and upper end performance.
And with regards to the weird feeling that it gave initially, not a problem anymore. Feel has improved!
At a price of under $200 from japan for a set of front and rear pads, for your $60k+ car, this is an utter no brainer. To the unlucky souls who didn't join the group buy and have nice wheels, I advise you get some!